filthy vs phallic

filthy

adj
  • Obscene or offensive. 

  • Covered with filth; very dirty. 

  • Very unpleasant or disagreeable. 

verb
  • To make very dirty; to saturate something with dirt. 

  • To cover in filth. 

phallic

adj
  • Relating to, or characteristic of the penis. 

  • Shaped like an erect human penis. 

How often have the words filthy and phallic occurred in a corpus of books? (source: Google Ngram Viewer )